Socket types
In a node tree, node sockets are the data connection points, and so the first line of validation must happen when a link is made between two node sockets. In the built-in Blender node tree editors, invalid links are indicated by red lines, in this editor, invalid links are immediately deleted.
As a baseline, sockets can only be linked to a socket of the same type, with a few exceptions:
- there are a few nodes that are incompatible with each other despite having matching sockets (eg.: translation - rotation nodes)
- the string value socket accepts connection from bone sockets (for use in the selection input of animations)
- the list socket accepts connection from all list type sockets
- the universal socket accepts connection from any type of socket (used in the data inspector nodes)
